TY  - JOUR
AU  - V. S. Malakhovskii
TI  - On a class of congruences of second-order curves with a degenerate focal surface
JO  - Doklady Akademii Nauk
PY  - 1962
SP  - 765
EP  - 766
VL  - 146
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1962_146_4_a6/
LA  - ru
ID  - DAN_1962_146_4_a6
ER  -